Head gasket replacement presents new dilemma?

Could have been arcing out and missing. I'd be more concerned as to why a gasket blew on a new build..which gaskets did you use? Some can overhang the bores just a tad on these. I don't see how a missing cylinder could blow a gasket, but...? Did you install the heads? Post a picture of the gasket if you still have it..what a bummer.